Obama, 59, said he has complete confidence in the country's health authorities, including immunologist Anthony Fauci.

If Anthony Fauci tells me that this vaccine is safe and can immunize against Covid, I will definitely take it, he said in a radio interview on SiriusXM , excerpts of which were shared Wednesday on YouTube.

I promise you that when vaccination is done for people who are less at risk, I will take it. I may end up doing it on television or filming it, just so people know that I trust this science, he explained.

A George W. Bush representative later told CNN that the 74-year-old Republican former president was also willing to promote vaccines, administering the dose before the cameras.

And Bill Clinton's spokesman, Ángel Ureña, also told CNN that the former Democratic president, also 74, would be publicly vaccinated "if that encourages all Americans to do the same.

The topic of vaccination divides opinions. Some believe that it is the path back the normality before covid-19, others are highly skeptical that the vaccines have been developed in such rush, and doubt that the testing and trials would be sufficient to provide their safety to humans.